CVE-2026-47676
Hono is a Web application framework that provides support for any JavaScript runtime.
Published May 28, 2026 · updated Oct 14, 2026 · hono hono
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte characters, resulting in the mounted sub-application receiving an incorrect path. This vulnerability is fixed in 4.12.21.
Timeline
Detection, updates, and resolution for this record.
May 28, 2026 · NIST NVD
Detected
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte character
Oct 14, 2026 · NIST NVD
Updated
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsistency causes the prefix to be stripped at the wrong position when the path contains percent-encoded multi-byte character
Affected
- cpe hono/honoversion unspecified
Sources
- CVE.orgCVE-2026-47676
Official CVE identifier
cve.org - FIRST EPSSCVE-2026-47676
30-day exploitation probability 0.3%
first.org - NIST NVDCVE-2026-47676
Hono is a Web application framework that provides support for any JavaScript runtime. Prior to 4.12.21, app.mount() strips the mount prefix from the incoming request path using the raw URL pathname, while route matching is performed against the percent-decoded path. This inconsis
nvd.nist.gov